python opencv 图像膨胀

代码：

import cv2
import numpy as np
# 图像膨胀
def dilate_img(img,a,iterations):
    kernel = np.ones((a,a),np.uint8)
    dilate = cv2.dilate(img,kernel,iterations = iterations)
    return dilate
# 回调函数，因为只能传一个参数，不方便，所以pass
def nothing(pos):
    pass
# 图片路径
path = "2.jpg"
#读取图片
img = cv2.imread(path,1)
# 创建老窗口
cv2.namedWindow('OldImg')
# 绑定老窗口和滑动条（滑动条的数值）
cv2.createTrackbar('a', 'OldImg', 1, 30, nothing)
cv2.createTrackbar('iterations', 'OldImg', 1, 100, nothing)
while True:
    # 提取滑动条的数值
    a = cv2.getTrackbarPos('a', 'OldImg')
    iterations = cv2.getTrackbarPos('iterations', 'OldImg')
    # 滑动条数字传入函数img_dilated中，并且调用函数img_dilated
    dilated = dilate_img(img,a,iterations)
    # 绑定 img 和 dilated
    result = np.hstack([img,dilated])
    cv2.imshow('OldImg', result)
    # 设置推出键
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
# 关闭窗口
cv2.destroyAllWindows()

效果